{"id":"19f4eab6-5aef-4450-9084-d1272257ae1a","shortId":"m2Tmdb","kind":"x402","title":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, paid in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/charges/13` is listed as \"Premium API Access\" and returns a standard x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header to each POST request. The payment address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the timeout is 300 seconds.\n\nDocumentation is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. It is unclear what specific data or functionality the `/api/v1/charges/13` endpoint returns, as the description is simply \"Premium API Access\" with no further detail. The broader platform's individual endpoint capabilities (sentiment analysis, embeddings, etc.) are listed but not documented.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","exchange-rates","gas-estimates","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","crypto api payments","402 payment required"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no usable content","The specific endpoint /api/v1/charges/13 has no description beyond 'Premium API Access' — its actual functionality is unknown","It is unclear whether the listed AI/finance/utility endpoints are fully functional or placeholders"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/13","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/charges/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schemas, no documentation beyond a landing page listing, and the specific endpoint's purpose ('Premium API Access') is undefined. The docs, pricing, and README pages are all empty wallet-connect 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'/api/v1/charges/13':113,236 '/call':19,38 '/docs':197 '/pricing':198 '/readme':201 '0.02':18,37,99,135 '000':130 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':176 '20':129 '300':181 '402 payment required' '6':140 'access':119,246 'across':58 'address':174 'ai':12,31,68 'ai-inference' 'analysi':72,259 'analyt':62 'api':5,24,45,118,154,245 'attach':162 'avail':191 'base':8,27,107,131,143 'base usdc api' 'broad':50 'broader':252 'caller':160 'capabl':257 'catalog':51 'categori':60 'challeng':125 'classif':75 'classification' 'connect':207 'content':213 'convers':92 'crypto api payments' 'data':11,30,61,65,232 'data-analytics' 'decim':141 'descript':241 'detail':250 'document':183,222,266 'embed':76,260 'embeddings' 'enabl':44 'endpoint':16,35,57,95,111,192,237,256 'estim':86 'etc':261 'exact':150 'exampl':226 'exchang':81 'exchange-rates' 'export':66 'extrem':185 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':234 'gas':85 'gas-estimates' 'generat':93 'geocod':90 'geocoding' 'header':167 'individu':255 'infrastructur':88 'insight':67 'key':155 'land':188 'learn':70 'limit':158 'list':115,190,263 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'made':146 'metric':63 'micropayment api' 'network':108 'no-api-key' 'offer':48 'openapi':217 'page':189,202 'paid':102 'pay':2,21,54 'pay per call api' 'pay-per-request':1,20,53 'payment':144,166,173 'per':3,22,55,100 'platform':6,25,46,253 'post':170 'premium':117,244 'price':79,97,194 'prompt':209 'quot':84 'rate':82,157 'render':204 'report':64 'request':4,23,56,101,126,171 'request/response':220 'requir':159 'return':121,238 'schema':221 'scheme':151 'second':182 'sentiment':71,258 'sentiment-analysis' 'simpli':161,243 'sinc':137 'spars':186 'spec':218 'specif':110,231 'standard':123 'summar':74 'text':73 'text-summarization' 'timeout':179 'token':83 'unclear':229 'unit':132 'usag':225 'usd':136 'usdc':104,134,138 'usdc-base' 'use':139 'util':15,34,89 'valid':91 'via':9,28,147 'wallet':208 'web3':78 'x':165 'x-payment':164 'x402':10,29,43,124,149 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b3807607-53d5-40a7-b30a-bb76c1b749e8","listingId":"19f4eab6-5aef-4450-9084-d1272257ae1a","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/charges/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:05.516Z"}],"sources":[{"listingId":"19f4eab6-5aef-4450-9084-d1272257ae1a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:05.516Z","lastSeenAt":"2026-04-23T11:03:19.310Z"}],"details":{"listingId":"19f4eab6-5aef-4450-9084-d1272257ae1a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/13 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/charges/13 requires up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/13"},{"claim":"Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"The /docs, /pricing, /api, and /README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting data with instant pay-per-use billing","Using utility services like geocoding, validation, and conversion without subscriptions"],"bestFor":["Agents and developers who want instant API access without registration or API keys","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions","Crypto-native applications already operating on the Base network with USDC"],"notFor":["High-volume production workloads where per-request costs would accumulate significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.395Z"},"updatedAt":"2026-04-23T11:03:19.310Z"}}